| [969] | 1 | //
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| 2 | // ********************************************************************
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| 3 | // * License and Disclaimer *
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| 4 | // * *
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| 5 | // * The Geant4 software is copyright of the Copyright Holders of *
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| 6 | // * the Geant4 Collaboration. It is provided under the terms and *
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| 7 | // * conditions of the Geant4 Software License, included in the file *
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| 8 | // * LICENSE and available at http://cern.ch/geant4/license . These *
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| 9 | // * include a list of copyright holders. *
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| 10 | // * *
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| 11 | // * Neither the authors of this software system, nor their employing *
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| 12 | // * institutes,nor the agencies providing financial support for this *
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| 13 | // * work make any representation or warranty, express or implied, *
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| 14 | // * regarding this software system or assume any liability for its *
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| 15 | // * use. Please see the license in the file LICENSE and URL above *
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| 16 | // * for the full disclaimer and the limitation of liability. *
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| 17 | // * *
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| 18 | // * This code implementation is the result of the scientific and *
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| 19 | // * technical work of the GEANT4 collaboration. *
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| 20 | // * By using, copying, modifying or distributing the software (or *
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| 21 | // * any work based on the software) you agree to acknowledge its *
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| 22 | // * use in resulting scientific publications, and indicate your *
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| 23 | // * acceptance of all terms of the Geant4 Software license. *
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| 24 | // ********************************************************************
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| 25 | //
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| 26 | // $Id: G4hBremsstrahlungModel.cc,v 1.3 2008/07/22 16:15:16 vnivanch Exp $
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| [1196] | 27 | // GEANT4 tag $Name: geant4-09-03-cand-01 $
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| [969] | 28 | //
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| 29 | // -------------------------------------------------------------------
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| 30 | //
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| 31 | // GEANT4 Class file
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| 32 | //
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| 33 | //
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| 34 | // File name: G4hBremsstrahlungModel
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| 35 | //
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| 36 | // Author: Vladimir Ivanchenko on base of G4MuBremsstrahlungModel
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| 37 | //
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| 38 | // Creation date: 28.02.2008
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| 39 | //
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| 40 | // Modifications:
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| 41 | //
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| 42 |
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| 43 | //
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| 44 | // Class Description:
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| 45 | //
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| 46 | //
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| 47 | // -------------------------------------------------------------------
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| 48 | //
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| 49 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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| 50 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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| 51 |
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| 52 | #include "G4hBremsstrahlungModel.hh"
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| 53 |
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| 54 | using namespace std;
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| 55 |
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| 56 | G4hBremsstrahlungModel::G4hBremsstrahlungModel(const G4ParticleDefinition* p,
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| 57 | const G4String& nam)
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| 58 | : G4MuBremsstrahlungModel(p, nam)
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| 59 | {}
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| 60 |
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| 61 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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| 62 |
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| 63 | G4hBremsstrahlungModel::~G4hBremsstrahlungModel()
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| 64 | {}
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| 65 |
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| 66 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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| 67 |
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| 68 | G4double G4hBremsstrahlungModel::ComputeDMicroscopicCrossSection(
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| 69 | G4double tkin,
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| 70 | G4double Z,
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| 71 | G4double gammaEnergy)
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| 72 | // differential cross section
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| 73 | {
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| 74 | G4double dxsection = 0.;
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| 75 |
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| 76 | if( gammaEnergy > tkin) return dxsection ;
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| 77 | // G4cout << "G4hBremsstrahlungModel m= " << mass
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| 78 | // << " " << particle->GetParticleName() << G4endl;
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| 79 | G4double E = tkin + mass ;
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| 80 | G4double v = gammaEnergy/E ;
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| 81 | G4double delta = 0.5*mass*mass*v/(E-gammaEnergy) ;
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| 82 | G4double rab0=delta*sqrte ;
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| 83 |
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| 84 | G4int iz = G4int(Z);
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| 85 | if(iz < 1) iz = 1;
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| 86 |
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| 87 | G4double z13 = 1.0/nist->GetZ13(iz);
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| 88 | G4double dn = mass*nist->GetA27(iz)/(70.*MeV);
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| 89 |
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| 90 | G4double b = btf;
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| 91 | if(1 == iz) b = bh;
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| 92 |
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| 93 | // nucleus contribution logarithm
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| 94 | G4double rab1=b*z13;
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| 95 | G4double fn=log(rab1/(dn*(electron_mass_c2+rab0*rab1))*
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| 96 | (mass+delta*(dn*sqrte-2.))) ;
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| 97 | if(fn <0.) fn = 0. ;
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| 98 |
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| 99 | G4double x = 1.0 - v;
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| 100 | if(particle->GetPDGSpin() != 0) x += 0.75*v*v;
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| 101 |
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| 102 | dxsection = coeff*x*Z*Z*fn/gammaEnergy;
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| 103 |
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| 104 | return dxsection;
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| 105 | }
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| 106 |
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| 107 | //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
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